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Cover
Oct. 30, 2019
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 30, 2019
Entity File Number 000-30739
Entity Registrant Name INSMED INCORPORATED
Entity Central Index Key 0001104506
Entity Tax Identification Number 54-1972729
Entity Incorporation, State or Country Code VA
Entity Address, Address Line One 10 Finderne Avenue
Entity Address, Address Line Two Building 10
Entity Address, City or Town Bridgewater
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 08807
City Area Code 908
Local Phone Number 977-9900
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol INSM
Security Exchange Name NASDAQ
Entity Emerging Growth Company false